My heating system has all of a sudden statrted.

MGFLW1960

2002 CHEVROLET IMPALA

190,000 MILES

My heating system has all of a sudden statrted not getting warm all the time especially if I have it on defrost/floor. I had thermostat changed and system flushed. I have kept the car in great mechanical condition, no other problems. Any ideas?

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Friday, December 21st, 2012 AT 12:01 AM

2 Replies

FREEMBA

EXPERT

1,158 POSTS

First of all make sure that the coolant level is correct.

if still no heat, remove the blend door actuator (under dash). turn the "arm" that the actuator fits onto. this will open the heater door. if heat now is available, replace the actuator.

this link will help.

Before removing anything I would also make sure both heater hoses going into the heater core at the firewall are getting too hot to hold when the engine is warmed up?Also watch if the blend door is operating.